Acting School Principal Peter Willmott says the school condemns the behaviour and is urging anyone with information to go to the police.

"The school community is distressed and upset by the incident.

"The student group and agricultural staff have taken a blow and are very affected by it.

"The alpacas had been with the school for 11-years after being introduced when they were just six-months old ...so some people are certainly devastated and traumatised by the loss," says Mr Willmott.

He says the Caboolture community is equally traumatised and the school has received substantial support.

"People have rung with their support and messages have been dropped in for the students ...the alpacas will be missed and I believe a fair bit of information has already been given to the police - the community is rallying together to find who's responsible," says Mr Willmott.

Police continue the investigation

Police say two males attacked the animals at about 5:00am AEST on Saturday morning.

One of the alpacas was found dead at the scene while the other was seriously injured and had to be euthanized.

It is believed the animals sustained severe head injuries after being attacked with an iron bar. The offenders also freed horses from the same enclosure.

Officers are searching for the males who were captured by security cameras - One of them was wearing a blue shirt and jeans and white shoes and the other was dressed in black shorts, a white jumper and red cap. If you have any information contact Crime Stoppers anonymously via 1800 333 000 or crimestoppers.com.au 24hrs a day.

RSPCA shocked by the attack

RSPCA spokesperson Michael Beatty says the act is appalling.

"To be honest, it's up there with the torture of the puppy in Moranbah near Mackay about four years ago - it's just appalling. I can't imagine what pleasure one can get out of bashing to death an animal.

"Alpacas are placid animals, and these two were use to having young male students tend to them, so they wouldn't have known what was coming.

"We just really urge anyone to go to the police with the information."

Mr Beatty says it was deliberate act of violence.

"It's obvious it was intentional, the men went there to bash those animals ...without meaning to sound melodramatic, there are links between animal cruelty and child abuse and domestic violence, it's clearly documented and you really don't want those type of people living next to you."